Test JS script file

Selected file: 051null_comparison.js
Compare console.log() outputs in browser and NodeJS.
Notice: Open browser's console in FireBUG!

  1. 001syntax_unicode.js
  2. 010number_DecToHex.js
  3. 011number_HexToDec.js
  4. 012number_toExponential.js
  5. 013number_modulo.js
  6. 014number_division_by_zero.js
  7. 015number_NaN.js
  8. 016number_infinity.js
  9. 017number_isFinite.js
  10. 018number_isNaN.js
  11. 019number_negative_zero.js
  12. 020number_float_rounding_error.js
  13. 030string_htmlTags.js
  14. 030string_multiline.js
  15. 031string_length.js
  16. 032string_concatenate.js
  17. 032string_concatenate2.js
  18. 033string_minus.js
  19. 035stringmethods_charAt.js
  20. 035stringmethods_concate.js
  21. 035stringmethods_indexOf.js
  22. 035stringmethods_match.js
  23. 035stringmethods_match_memory.js
  24. 035stringmethods_replace.js
  25. 035stringmethods_search.js
  26. 035stringmethods_split.js
  27. 035stringmethods_toString.js
  28. 035stringmethods_toUpperCase.js
  29. 035stringmethods_trim.js
  30. 036string_regexTest.js
  31. 040bool_falsy.js
  32. 040bool_truthy.js
  33. 041bool_comparison.js
  34. 042bool_conditional_operator.js
  35. 043bool_logic_operators.js
  36. 044bool_not_exe_function.js
  37. 050null_typeof.js
  38. 051null_comparison.js
  39. 053undefined_var.js
  40. 054ReferenceError.js
  41. 055global_object_browser.js
  42. 055global_object_node.js
  43. 056global_properties_browser.js
  44. 056global_properties_node.js
  45. 057wrapper_object.js
  46. 058wrapper_object_readonly.js
  47. 60object_reference.js

..:: Source code - 051null_comparison.js ::..

/**
 * comparison of null and empty string
 */

console.log(Boolean('' == null)); //false
console.log(Boolean('' === null)); //false
console.log(Boolean(0 === null)); //false
console.log(Boolean({} === null)); //false
console.log(Boolean({} == null)); //false

console.log('--------------');

var x = null;
if (!x) {
 console.log('x is null');
} else {
 console.log('x is not null');
}
 

..:: NodeJS Console - 051null_comparison.js ::..

$ node 051null_comparison.js 
false
false
false
false
false
--------------
x is null

$ps -aux | grep node (list all node processes)
sasa        1194  0.5  0.4 1303844 81372 ?       Ssl  Oct24 265:02 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  0.9  0.8 11722608 138848 ?     Ssl  Oct24 463:36 node /home/sasa/dex8/dex8-api/starter.js
sasa        1207  0.4  0.4 1303628 72080 ?       Ssl  Oct24 217:16 node /home/sasa/regoch/regoch-www/server
sasa        1208  0.3  0.4 1304912 73624 ?       Ssl  Oct24 189:51 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.9  0.6 11823560 102028 ?     Ssl  Oct24 458:39 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.5 11812620 96940 ?      Ssl  Oct24 290:31 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.7  0.5 1330860 84552 ?       Ssl  Oct24 388:13 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.3  0.4 1300548 69580 ?       Ssl  Oct24 192:54 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1297724 67424 ?       Ssl  Oct24 190:16 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  3.2  2.8 12155764 459000 ?     Ssl  Oct24 1622:56 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1449  0.3  0.4 1168360 66368 ?       Ssl  Oct24 199:27 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1528  1.7  2.7 33105416 443964 ?     Ssl  Oct24 878:09 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.3  0.3 1100388 64348 ?       Ssl  Oct24 199:17 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.3  0.3 1100644 64448 ?       Ssl  Oct24 199:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.3  0.3 1100900 64996 ?       Ssl  Oct24 198:47 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.3  0.4 1101416 65816 ?       Ssl  Oct24 198:40 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.3  0.3 1101156 64848 ?       Ssl  Oct24 198:39 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.3  0.4 1167456 65664 ?       Ssl  Oct24 198:50 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.3  0.3 1099872 62872 ?       Ssl  Oct24 194:46 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.3  0.3 1100136 63796 ?       Ssl  Oct24 196:08 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  1.6  0.9 11858256 161192 ?     Ssl  Oct24 834:08 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     2628167  0.8  0.7 1169656 125956 ?      Ssl  Nov04 290:19 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.5 11813836 97444 ?      Ssl  Nov06 204:59 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.4  0.5 11798408 83596 ?      Ssl  Nov06 133:53 node /home/sasa/@mikosoft/dodo-examples/server/index.js
www-data 3433503  0.0  0.0   2608   596 ?        S    14:56   0:00 sh -c ps -aux | grep node
www-data 3433505  0.0  0.0   3304   712 ?        S    14:56   0:00 grep node